RB = Rolls Barnoldswick
CF = Commercial Fan
= Commercial Jet
CFM = Commercial Fan Moteur
Sub-naming conventions for GE
major models are, for example, Commercial Fan 6 (CF6).
This becomes a family name - and now has acquired a "Brand" value. So quite a range of engines are designated under the "CF6" family name, even though this spans CF6-6 up through CF6-80, where you could have easily designated them CF6, CF7, etc.
Simlarly CFM56 was named using part GE
, part SNECMA methods. SN
designates in sequence "Moteur 56", "Moteur 88" etc. So we have
CFM56 = Commercial Fan Moteur 56
The CFM56 is now a brand so it acquired sub types CFM56-2, -3, -5, etc. The missing numbers (-1, -4) did exist as studies. Extra credit if you know which applications they could have been. The -6 was not used to avoid possible confusion with CF6.
Further models within a family have names that designate the basic engine, such as
These are just the start....
suffix B - Boeing, A - Airbus, D - Douglas
sometimes suffix F means FADEC (vs PMC) but this is so common now, so no longer used for new programs.
first example CF6-80C2D1F is a "CF6-80C2" engine built for the first Douglas installation (D1) with a FADEC
2nd example CF6-80C2B6F is a "CF6-80C2" engine for the 6th Boeing application (B6) with FADEC. Why 6? Different thrust ratings for Boeing would be counted B1, B2
3rd example CF6-80E1A1 is a "CF6-80E1" engine for the first Airbus application (A1).
There's more...but that will have to do for now.